H2S对CH4着火延迟及还原NO影响的数值模拟  

Numerical simulation of the effect of H2S on CH4 ignition delay and NO reduction

作　　者：孙巧群[1] 王义德 高建民[2] 杜谦[2] 吴少华[2] SUN Qiaoqun;WANG Yide;GAO Jianmin;DU Qian;WU Shaohua(College of Aerospace and Civil Engineering, Harbin Engineering University,Harbin 150001, China;Research Institute of Combustion Engineering, Harbin Institute of Technology,Harbin 150001, China;Shandong Special Equipment Inspection Institute Co., Ltd., Jinan 250101, China)

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001 [2]哈尔滨工业大学燃烧工程研究所,哈尔滨150001 [3]山东省特种设备检验研究院有限公司,济南250101

出　　处：《哈尔滨工业大学学报》2019年第7期49-55,62,共8页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51506035)

摘　　要：为探究硫化氢(H2S)在常压范围内对甲烷(CH4)燃烧特性的影响,采用化学动力学软件CHEMKIN-PRO中的0-D和PFR反应器研究H2S浓度、过量空气系数、压力和温度对CH4点火延迟及还原NO的影响,并通过敏感性和生成率分析揭示其化学动力学机理.模拟结果表明:H2S的存在促进活性基团(H,O,OH,HO2,HO2和H2O2)的生成速率,从而缩短预混气点火延迟时间,且在低温下的影响作用更加明显;预混气点火延迟时间随着过量空气系数的增大而减小;压力增加亦有利于缩短点火延迟时间.H2S可降低CH4/H2S还原NO的温度,主要由于H2S降低CH4的反应温度,使还原性基团CHi在较低温度下产生;但同时H2S的存在,在一定程度上降低NO的还原效率,且在贫氧气氛中的影响更为显著.To investigate the effects of hydrogen sulfide (H2S) on the combustion characteristics of methane (CH4) in atmospheric pressure range, the 0-D and PFR reactors were adopted in CHEMKIN-PRO chemical kinetics software to investigate the effects of H2S concentration, excess air coefficient, pressure and temperature on CH4 ignition delay and NO reduction, meanwhile sensitivity analysis was used to reveal the chemical kinetics mechanism. The modeling results showed that the H2S could promote the formation rate of active groups (H, O, OH, HO2, HO2 , H2O2), so premixed gas ignition delay time was reduced, and the effect was more obvious at low temperature. The premixed gas ignition delay time is decreased with the increase of excess air coefficient and pressure. The H2S decreases the CH4 reaction temperature and reductive group CH i are generated at lower temperature, so the H 2S decreases the temperature of NO reduction by CH4 /H2S. But the existing of H2S reduces NO reduction efficiency to a certain extent, and the effect is more remarkable in fuel-rich atmosphere.

关 键 词：甲烷 硫化氢 点火延迟时间 氮氧化物 化学动力学 数值模拟 敏感性分析 

分 类 号：TK16[动力工程及工程热物理—热能工程]